Te Tūranga o ngā Mīhini Whakaoho i roto i te Hī ika
I roto i ngā mahi hī ika o ēnei rā—ahakoa i roto i te mahi pāmu ika wai māori, wai māori, wai tote rānei—he mea nui te kounga o te wai hei angitu. He maha ngā kaimahi pāmu e aro ana ki te whāngai kai, ki ngā purapura kounga teitei, me te whakahaere i ngā roto, engari he maha ngā wā ka warewarehia tētahi āhuatanga matua: te wātea o te hāora rewa (DO). Heoi anō, ko ngā ika me ētahi atu rauropi whakatipu, pērā i te kōura, e whakawhirinaki nui ana ki te hāora hei manawa, hei tipu, hei noho hauora hoki. Koinei te wāhi e whai wāhi nui ai ngā pūwero hau. Ehara i te mea he taputapu tāpiri noa iho ngā pūwero hau, engari he taputapu whakahaere kounga wai ka taea te whakanui ake i te hua, te whakaiti i te mōrearea o te mate nui, me te pupuri i te pumau o ngā pūnaha rauropi roto.
Te Mārama ki ngā Aerators me tā rātou Mahi
He taputapu te aerator e whakanui ana i ngā taumata hāora rewa i roto i te wai, ā, e āwhina ana ki te huri i te wai i roto i ngā roto, i ngā roto ika rānei. Ko te tikanga, ka mahi ngā aerator mā te neke i te wai, ka hua ake he whakawhiti hau i te mata o te wai. Ina pakaru te mata o te wai i ngā pītiti, i ngā ngaru rānei, ka piki ake te wāhi e pā ana te wai ki te hau, ka ngāwari ake te rewa o te hāora mai i te hau ki roto i te wai. Hei tāpiri, ka āwhina te nekehanga wai ki te tohatoha i te hāora puta noa i te roto, tae atu ki ngā wāhi kua pau pea te hāora pērā i te raro.
I roto i te mahi, ka āwhina hoki ngā pūwero hau ki te whakaiti i te pāmahana me te wehewehenga hāora (he nui ake te hāora i ngā paparanga wai o runga, he iti te hāora i ngā paparanga o raro). I te tohanga o te wai, ka taea te whakaranu i te wai o raro he iti te hāora ki te wai mata he nui te hāora.
Te Pupuri i te Hāora Whakarewa mō te Tipu me te Oranga
He mea nui te hāora rewa i roto i te mahi ahuwhenua ika. Ina iti te DO, ka pāngia ngā ika e te ahotea, te kore hiahia kai, te kore tipu, me te ngoikore o te pūnaha ārai mate. I roto i ngā āhuatanga tino kino, ka taea e te hekenga nui o te DO te mate nui i roto i te wā poto, inā koa i te pō, i te atatu rānei.
Ka āwhina ngā pūwero hau ki te pupuri i te DO ki ngā taumata haumaru. He rerekē ngā paepae hiahia hāora mō te maha o ngā taonga hī ika, engari i te nuinga o te wā, ko ngā taumata DO i runga ake i te 4–5 mg/L e kiia ana he haumaru ake mō te whakatipu kaha. I roto i ngā pūnaha kiato teitei, ka piki ake te hiahia hāora me te koiora ika/kōura, ā, ka waiho ngā pūwero hau hei mea nui, ehara i te mea whiriwhiri.
Te Whakaiti i te Mōrearea o te "Matenga Wā Moata" (Te Pakaru o te Hāora)
Ko tētahi o ngā raruraru tawhito i roto i ngā roto me ngā pāmu ika ko te hekenga o te hāora i te pō. I te awatea, ka whakaahua ngā phytoplankton, ka whakaputa hāora, nō reira ka piki ake te DO. Heoi, i te pō, ka mutu te whakaahua, i te mea ka haere tonu te manawa o ngā ika, o ngā plankton, me ngā moroiti - ā, ka nui ake te whakamahinga hāora. Nō reira, he maha ngā wā ka tae te DO ki tōna taumata iti rawa i mua i te ata.
Mā te whakamahi i ngā pūwero hau mai i te pō ki te ata ka ārai i te "hinga o te hāora." I roto i te nuinga o ngā wā, ko te whakatau ki te tahuri i te pūwero hau i te wā tika ka waiho hei rerekētanga i waenga i te kotinga angitu me te ngaronga nui.
Te Āwhina i te Whakahaere i ngā Para Waro me te Haukini
Ka puta he para rauropi i te mahi ahuwhenua nui: he toenga kai, he paru, me te koiora plankton mate. Ka pirauhia tēnei para e ngā huakita. Me whai hāora (aerobic) te tukanga pirau. Mena he nui te hāora, ka haere tonu te pirau, ā, kāore e nui ngā matū paitini e puta. Heoi, ki te iti te hāora, ka puta pea ngā āhuatanga anaerobic i te raro o te roto, ka puta ai ngā hau kino pēnei i te hauwai sulfide (H₂S), he kakara kino, he paitini hoki.
Mā te whakanui ake i te hāora me te whakaoho i te wai, ka āwhina ngā pūwero hau ki te aukati i te hanganga o ngā rohe anaerobic. Hei tāpiri, ka tautokohia e te whakawero hau te huakita nitrifying, e huri ai te haukini (NH₃) hei nitrite (NO₂⁻) kātahi hei nitrate (NO₃⁻). Ahakoa he kino hoki ngā taumata nitrite ina teitei, ka taea e te pūnaha whakahaere wai pai me te whakawero hau tika te āwhina ki te pupuri i te taurite hauota kia kore ai e nui te haukini ki ngā taumata paitini.
Te Whakapai ake i te Tohatoha Whāngai me te Mahi Ika
Ehara i te mea ko te kounga o te wai anake te pānga o ngā pūwero hau, engari ko te whanonga o ngā ika anō hoki. He maha ngā wā ka huihui ngā ika ki ngā wāhi he nui te taumata o te hāora. Mā te pūwero hau ka pai ake te tohatoha o ngā ika i roto i te roto, ka whakaiti i te whakataetae mō te hāora, ka whakapiki ake hoki i te mahi whāngai. Ka hua ake tēnei i te ōwehenga huringa whāngai pai ake (FCR).
Heoi anō, me whai whakaaro ki te whakatakotoranga o ngā aerator. Ka taea e ngā aerator te whakanoho koretake te hanga i te au kaha rawa ki tetahi taha, ka pēhia ngā ika, ka panaia rānei te kai ki te taha o te roto. Mā te whakatakotoranga tika me te tatau i ngā aerator ka āwhina i te waihanga i te tohanga pai me te kore e hanga i ngā "rohe mate" me te iti o te tohanga.
Te Whakanui Ake i te Kaha Kawe o te Puna
Ko tētahi o ngā tino take e rongonui ai ngā pūwero hau i roto i ngā mahi hī ika, nā te mea ka taea te whakanui ake i te maha o ngā kararehe. Ki te kore he pūwero hau, ka taea noa e ngā roto te whakauru i tētahi momo koiora i mua i te noho hei take whakawhāiti i te hāora. Mēnā he nui te pūwero hau, ka taea e ngā kaimahi pāmu te whakanui ake i te maha o ngā ika/kōura i ia mita tapawha nā te nui haere o te hāora me te pai ake o te rere o te wai.
Heoi anō, me taurite hoki te whakanui ake i te kiato o ngā kararehe me te whakahaere whāngai, te whakahaere kounga wai, me te pūnaha rerenga wai, te pūnaha whakawhiti wai rānei e tika ana. He taputapu kaha ngā pūwero hau, engari ehara i te otinga kotahi mō te katoa.
Ngā Momo Pūwero i roto i te Hī ika
He maha ngā momo pūwero hau e whakamahia ana i runga i te rahi o te pakihi me ngā āhuatanga o te roto, o te puna ika rānei:
1. Pūwhakahauhau wira hoe
He mea noa i roto i ngā roto kōura. Ka puta he pītiti me ngā ia kaha hei rere. He pai mō ngā wāhi whānui me te whakatipu kaha.
2. Pūwero hau me te kōhatu whakapūwero hau
He whānuitia te whakamahinga i roto i ngā roto tāpaurinī, i te koiora wai, i ngā pūnaha tukurua rānei, ka puta he mirumiru hau e whakanui ana i te DO me te āwhina i te whakaranu wai.
3. Pūwhakaoho puna
Ka whakapai ake i te āhua me te whakanui ake i te hāora. He pai mō ngā puna ika whakapaipai, ngā puna rānei e hiahia ana kia hau mātao.
4. Pūwero hau Venturi
Ka whakamahia te pānga venturi hei kukume i te hau ki roto i te rere o te wai. He whai hua, ā, he maha ngā wā ka whakamahia i roto i ētahi pūnaha me ngā papu.
Me whai whakaaro te kōwhiringa o tētahi pūreretā hau ki ngā hiahia hāora, te rahi o te roto, te hohonu, te momo taonga, tae atu ki te wātea o te hiko me ngā utu whakahaere.
Ngā Rautaki Whakamahinga Pūwero Whai Hua
Mō te mahi tino pai o te pūwero hau, me whakatinana e ngā kaimahi pāmu tētahi rautaki, kaua e whakahaere noa i te taputapu i te rā katoa me te kore tatau. Ko te mea pai, me whakamahi te pūwero hau i runga i te aroturukitanga DO mā te whakamahi i tētahi taputapu ine. Heoi, ki te kore he mita DO e wātea ana, ka taea e te kaupapa mahi te whai i tētahi tauira whānui: te whakanui ake i ngā hāora pūwero hau mai i te pō ki te ata, inā koa i te wā roa o te rangi kapua, i muri i ngā wā whāngai roa, i te wā rānei ka tino pouri te tae o te wai nā te nui rawa o te plankton.
He mea nui anō hoki te tiaki i te aerator. Mā te wira paru, te diffuser kua purua, te motuka rānei e hē ana te mahi ka whakaiti i te pai o te hau, ka piki ake hoki ngā utu hiko mō ia waeine o te hāora e whakaputaina ana. Mā te tirotiro auau, te horoi, me te whakakapi i ngā wāhanga kua tawhito ka roa ake te ora o te taputapu.
Pānga Ōhanga me te Oranga Tonu
Mai i te tirohanga ōhanga, ka piki ake ngā utu haumi me te hiko mā te whakamahi i ngā pūwero hau. Heoi, he nui ake ngā painga i ērā atu: te pikinga o te ora, te tere ake o te tipu, te pumau ake o ngā kotinga, me te whakaiti i te mōrearea o te mate nui. Ka tautokohia hoki e ngā pūwero hau ngā mahi ahuwhenua kawenga ake nā te mea he pai ake te whakahaere i te kounga o te wai, ā, ka whakaitihia te tukunga para me te parahanga taiao mēnā ka whakahaerea tika.
I roto i te horopaki o te oranga tonutanga, me taurite te whakamahinga o te aerator me te whai huatanga o te pūngao. He maha ngā kaimahi pāmu e tīmata ana ki te whakaaro ki ngā motuka whai huatanga o te pūngao, ki ngā hoahoa aerator whai hua ake, me ngā puna pūngao rerekē pērā i ngā panera rā hei whakaiti i tō rātou whakawhirinaki ki te hiko tuku iho.
Whakamutunga
He mahi nui tā ngā pūwero hau i roto i te mahi ahuwhenua ika, e pupuri ana i te hāora rewa, e whakatau ana i te kounga o te wai, e tautoko ana i te pirau para, me te whakanui ake i te hua me te kaha o te roto. Ka āwhina ngā pūwero hau ki te ārai i ngā āhuatanga kino, inā koa i te pō, ka whakapai ake i te whai huatanga o te whāngai, me te whakaiti i te mōrearea o ngā mate e puta mai ana i te ahotea i puta mai i te kounga wai ngoikore. Mā te whiriwhiri tika i te momo pūwero hau, te whakanoho tika, me te whakahaere e hiahiatia ana, ko ngā pūwero hau tētahi o ngā haumitanga rautaki rawa atu mō te ahuwhenua ika haumaru ake, whai hua ake, me te whai hua ake.
Ki te hiahia koe, ka taea e au te whakarerekē i tēnei tuhinga ki ngā momo whakatipu motuhake (hei tauira, ngā roto kōura vaname, te ika kāpeti biofloc, te tilapia roto oneone) me te tāpiri i ngā taunakitanga mō te maha o ngā pūwero hau i runga i te whānui o te roto me te kiato o te whakatipu.
